Continental introduced its most sustainable tyre series to date- the UltraContact NXT, which is made of up to 65 percent renewable, recycled and mass balance certified materials without compromising on maximum safety and performance. 
The UltraContact NXT is an extension of Continental’s successful UltraContact family, launched in 2022. These tyres are suitable for electric and combustion engines and will be available for European tyre dealers starting in July.

According to Continental, it is the first tyre company to produce a tyre with maximum sustainable materials and EU tyre-label performance in large-scale production. The UltraContact NXT comes in 19 different sizes and has received the highest rating (“A”) on the EU tyre label for rolling resistance, wet braking, and exterior noise.

Depending on the tyre size, the UltraContact NXT is made from up to 65 percent renewable, recycled, and certified sustainable materials. Renewable materials make up to 32 percent of the tyre, including resins derived from leftover materials from the paper and wood industries. The company also uses silicate from rice husk ash to enhance grip, rolling resistance, and tyre lifespan.
“At Continental, safety, performance, and sustainability go hand in hand. With the UltraContact NXT, we deliver on our ambitious sustainability goals. This development represents a significant leap forward and demonstrates our technological leadership as well as our strong commitment to both sustainability and safety,” says Ferdinand Hoyos, Head of Continental’s Business Area Replacement Tires EMEA. He adds, “With its impressive performance, the UltraContact NXT pushes sustainability to the NXT level.”

Continental incorporates up to five percent recycled materials in the UltraContact NXT, obtained from mechanically processed end-of-life tyres. The company uses its ContiRe.Tex technology, which allows them to recycle between nine and fifteen plastic bottles for each tyre, depending on the tyre size. Additionally, recycled steel is used in the manufacturing process. Continental aims to achieve fully circular tyre production by 2050.

The UltraContact NXT also incorporates up to 28 percent of certified sustainable materials through the ISCC PLUS mass balance approach. These materials include synthetic rubber and carbon black made from biobased, bio-circular, and circular sources. Synthetic rubber is a crucial component in modern tyres, offering specific performance characteristics. Carbon black is used to optimize stability, strength, and durability. The ISCC PLUS certification ensures transparency and traceability in the supply chain, verifying sustainable criteria and certifying the resulting products.
 

Kraton Corporation, a leading global producer of speciality polymers and high-value biobased products derived from by-products of pine wood pulping, has received an International Sustainability and Carbon Certification (ISCC) PLUS certification for its manufacturing facility in Niort, France.

Kraton can now supply 100 percent ISCC PLUS-certified AMS and AMS Phenolics resins using a mass balance attribution approach thanks to the certification. Kraton's dedication to promoting the biobased and circular economy is further demonstrated by the Niort facility's accreditation. Kraton is committed to lowering carbon emissions and accelerating the shift to a more sustainable future by empowering clients to include more environmentally friendly products into their supply chains.

An independent multi-stakeholder project, the International Sustainability and Carbon Certification (ISCC) is a leading certification method that guarantees accurate mass-balancing bookkeeping and reporting of renewable and recycled materials across the supply chain.

Lana Culbert, Kraton Pine Chemicals VP of Marketing, said, “Our SYLVARES™ and SYLVATRAXX™ brands feature a range of high-performance AMS and AMS Phenolics resins used in speciality adhesives and tyre applications. Our ISCC PLUS journey began in 2021 with the certification of our Sandarne, Sweden facility. Earning this certification for our Niort plant marks a significant milestone, further expanding our portfolio of sustainable solutions.”

Sumitomo Rubber Industries, Ltd. has said that it has clarified the process of rubber breakdown, a crucial element that affects tyre longevity, through joint research with Professor Gert Heinrich at Dresden University of Technology (Saxony State, Germany).

In a special session called ‘Combining Physics, Chemistry & Engineering of Rubber: A Symposium in Honor of Charles Goodyear Medalist Gert Heinrich’, which was held in honour of the Professor's medal-winning achievement, the findings were presented in an invited talk at the American Chemical Society, Rubber division, ACS 2025 Spring Technical Meeting held in Orlando, Florida, US, on 6 and 7 March. Professor Heinrich is a member of the Leibniz Institute of Polymer Research Dresden, which took part in the collaborative effort.

Tyre durability is determined by cracking processes, which result in the development of cracks and rips in a rubber substance. The endurance of rubber was previously mostly assessed using tearing tests, but there were still numerous unanswered concerns regarding the microscale structural alterations at the crack tip. This effort identified a factor that determines the start and propagation of cracks in rubber by analysing the force applied to a fracture tip using a simulation approach. In rubber, a crack tip undergoes dilatation deformation to create voids, or microvoids within the item. The fracture gets worse as the voids expand and come together. It was also discovered that the tension focused on the fracture tip is lessened when voids emerge.

The German Rubber Industry Association (Wdk) is advocating for a thorough and legally enforceable regulation of the end-of-waste status for Germany and the whole of Europe. The association is pusing for the circular economy to be strengthened for tyres.

Valuable secondary raw materials are still legally regarded as waste since there are no consistent standards for the end-of-waste status, according to Stephan Rau, Technical Director of the WDW. This restricts the market integration of sustainable recycled materials, impedes investments and creates legal uncertainties. “We call for a comprehensive and binding end-of-waste regulation for Germany and the whole of Europe to strengthen the recycling sector, facilitate investment in modern technologies, and sustainably reduce the CO₂ footprint of the rubber and tire industry,” he said.

In order to adhere to the prescribed waste hierarchy and stop illicit exports, Rau also emphasised that lawmakers must quantitatively and openly document waste tyre flows. He added that waste tyres should only be gathered by approved disposal companies and pre-sorted based on their intended use.

On the important role of mechanically recycled tyre granules and powder, Rau said, "This is an important secondary raw material that is already used in a variety of durable and safe products. A clearly defined end to its waste status must be made more economically viable. To ensure the market success of tyre granules, a risk-based approach to assessing chemical ingredients is essential. Binding limit values ​​must be assessed using a migration analysis, i.e. based on their bioavailability. Second, the use of tyre granule products must become mandatory in the construction industry and infrastructure projects. The goal is clear: Recycling must be economically viable."

Kuraray, a global speciality chemicals company and one of the largest suppliers of industrial polymers and synthetic microfibres, has received ISCC PLUS certification for its thermoplastic elastomers SEPTON and HYBRAR as well as Liquid Rubber produced at the Company’s Kashima Plant at Ibaraki Prefecture.

ISCC PLUS makes sure that certified products, such biomass and recycled raw materials, are appropriately handled throughout their supply chains, including the manufacturing process, by applying the mass-balance technique.

In the five years preceding up to its centenary in 2026, Kuraray is carrying out its medium-term management strategy, PASSION 2026. In order to achieve the long-term Kuraray Vision 2026 of being a speciality chemical company that grows sustainably by integrating new foundational platforms into its own technologies and contributing to customers, society and the planet, the company will keep growing its range of products that improve the natural and living environments.